Biochemical reaction and mud-water separation integrated reactor

Abstract

The invention discloses a biochemical reaction and mud-water separation integrated reactor which comprises a tank body, and the bottom of the tank body is a funnel-shaped mud discharge area (2); a water distribution unit is arranged on the sludge discharge area (2), and a water distribution pipe comprises a water inlet pipe (6), a water mixing area (4) connected with the water inlet pipe and a water distribution branch pipe (8) connected with the water mixing area (4); a first rotating wheel (5) is arranged in the water mixing area (4); a plurality of water outlet holes (8) are formed in the water distribution branch pipes (7); a gas distribution unit is arranged above the water distribution unit and comprises a gas inlet pipe and a plurality of circular ring pipes which are concentrically arranged; and the air inlet pipe is communicated with the plurality of concentrically arranged circular ring pipes. The sludge-water separation and the biochemical reaction are integrated, and the granular sludge is favorably generated.

Description

Technical Field

[0001] The invention relates to a reactor integrating biochemical reaction and mud-water separation. Background Art

[0002] Biochemical reactors are the core technology for biochemical treatment of sewage (wastewater). They are categorized by hydraulic structure into three types: plug flow, mixing, and circulation. Each type has distinct performance characteristics. However, all three types share a common characteristic: two-dimensional planar flow. Therefore, the sludge produced within the biochemical reactors primarily behaves as activated sludge (except for biofilm processes).

[0003] Granular sludge is the result of the quantitative change to qualitative change of activated sludge. Both are sludge, but their properties are essentially different. The performance of granular sludge is far superior to that of activated sludge. Its mixed liquor concentration is high, the biological phase is rich, the sludge age is long, the biological development is good, and the activity is strong.

[0004] The three types of biochemical reactors currently available only produce activated sludge but cannot produce granular sludge. Summary of the Invention

[0005] The main purpose of the present invention is to provide a reactor integrating biochemical reaction and mud-water separation, which is conducive to the production of granular sludge.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A biochemical reaction and mud-water separation integrated reactor comprises a tank body (100), the bottom of the tank body is a funnel-shaped mud discharge area (2), the center of the bottom of the mud discharge area (2) is connected to a mud discharge pipe (3); a water distribution unit is provided above the mud discharge area (2), the water distribution pipe comprises a water inlet pipe (6), a water mixing area (4) connected to the water inlet pipe, and a water distribution branch pipe (8) connected to the water mixing area (4); a first impeller (5) is provided in the water mixing area (4); a plurality of water distribution branches (7) are provided A water outlet (8); an air distribution unit is provided above the water distribution unit, the air distribution unit comprising an air inlet pipe and a plurality of concentrically arranged annular pipes; the air inlet pipe is in communication with the plurality of concentrically arranged annular pipes; a plurality of air cones (11) are provided on each annular pipe (10); a guide tube (12) is provided in the middle of the tank body (100); a second rotor (13) is provided on the upper part of the guide tube (12); a mud-water separation device (14) is provided on the upper part of the tank body (100); and a water outlet trough (15) is provided at the upper end of the tank body (100).

[0008] In a preferred embodiment, there are multiple water distribution branch pipes (7), which are respectively connected to the mixed water areas (4); and the water distribution branch pipes (7) are radially distributed with the mixed water area (4) as the center.

[0009] In a preferred embodiment, the annular tube is a plurality of concentric annular tubes with different diameters, and each annular tube is provided with a plurality of air cones.

[0010] In a preferred embodiment, the second rotating wheel (13) and the first rotating wheel (5) are linked.

[0011] In a preferred embodiment, the mud-water separation device includes a set of inclined plate fillers; the mud-water mixture flows from bottom to top, and the mud flows downward along the inclined plates due to gravity, thereby performing mud-water separation.

[0012] In a preferred embodiment, the water outlet trough (15) is a ring-shaped triangular weir, which is arranged around the upper end of the tank body (100).

[0013] Another object of the present invention is to provide a sludge granulation method, using the above-mentioned device, the method includes the following steps: sewage is mixed with air released by the air cone, the water flow rotates and rises in the aeration zone (zone O) for complete mixing, aeration and oxygenation, and the ammonia nitrogen nitrification reaction process is carried out in this zone to make NH4 + -N turns into NO3 - -N; Most of the nitrate mixture enters the guide tube (12) from the upper end of the guide tube 12 under the negative pressure generated by the rotation of the second impeller (13) linked to the first impeller (5) at the top and bottom of the tank, and undergoes endogenous denitrification, which will produce NO3 - -N is reduced to N2; there are multiple reducing agents in the system, and the reaction process is a denitrification process mainly based on anaerobic carbon oxidation and anaerobic ammonium oxidation, supplemented by other reducing agents;

[0014] The denitrified mixed liquid enters the main aeration zone again to dilute the total nitrogen in the influent; the other part of the nitrate mixed liquid (1Q) is separated from the mud and water along the mud and water separation device (14) with inclined plates on the upper part of the biochemical reactor, and the supernatant flows out from the outlet trough (15) into the outlet pipe. The large particles of sludge slide down and meet the upward mixed liquid to form a sludge layer, which intercepts and filters the mixed liquid. In this area, solid, liquid and gas are fully mixed and reacted to form high-density bacterial flocs, which granulate the sludge.

[0015] Compared with the background technology, this technical solution has the following advantages:

[0016] 1. The device of the present invention can form granular sludge with high sludge concentration, rich biological phase, strong activity, and increased hydraulic retention time in the biochemical reactor;

[0017] 2. The biochemical reaction and mud-water separation are integrated, eliminating the need to build a sedimentation tank, saving land and investment;

[0018] 3. Asynchronous nitrification and denitrification are carried out in the biochemical reactor, and synchronous nitrification and denitrification are carried out inside the granular sludge, which has a high efficiency in degrading pollutants. Therefore, the biochemical reactor is small in size, has good effluent quality, saves space and investment.

[0019] 4. Multiple reduction reactions coexist in the biochemical reactor, so the operating cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and examples.

[0021] Figure 1 This is a schematic cross-sectional view of a reactor integrating biochemical reaction and mud-water separation in a preferred embodiment.

[0022] Figure 2 for Figure 1 The cross-sectional view in the AA direction shows the ring-type gas distribution pipe.

[0023] Figure 3 This is a top view of the water distribution branch pipe.

[0024] In the picture: 100-tank

[0025] 2- Mud discharge area 3- Mud discharge pipe 4- Mixed water area 5- First impeller 6- Water inlet pipe 7- Water distribution branch pipe 8- Water outlet 9- Air inlet pipe 10- Annular pipe 11- Air cone 12- Guide tube 13- Second impeller 14 Mud and water separation device 15- Water outlet trough DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "lateral", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or location relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] Please refer to Figures 1 to 3 A biochemical reaction and mud-water separation integrated reactor comprises a tank body 100. The bottom of the tank body is a funnel-shaped mud discharge area 2, and the center of the bottom of the mud discharge area 2 is connected to a mud discharge pipe 3 for discharging sludge.

[0028] A water distribution unit is located above the mud discharge area 2. The water distribution pipes include an inlet pipe 6, a mixing area 4, and branch pipes 8. The mixing area 4 is located in the center of the tank 100. The inlet pipe 6 enters the tank near the bottom and connects to the bottom of the mixing area 4. A first impeller 5 is installed within the mixing area 4. As the first impeller 5 rotates, it mixes the incoming water evenly, which is then distributed through branch pipes 7. There are five branch pipes 7, radially distributed around the mixing area 4 and spaced 72° apart. Each branch pipe 7 is equipped with multiple outlet holes 8.

[0029] An air distribution unit is provided above the water distribution unit, and the air distribution unit includes an air inlet pipe 9 and a plurality of concentrically arranged annular pipes 10. In this embodiment, it is composed of a plurality of concentric annular pipes 10 of different diameters. Each annular pipe 10 is provided with a plurality of air cones 11. The air inlet pipe 9 is connected to each annular pipe 10 respectively. The air cone 11 is funnel-shaped, and the bottom is connected to the inside of the annular pipe 10. Figure 1 In order to clearly show the position and shape of the air cone 11, it is deliberately enlarged.

[0030] A guide tube 12 is located in the middle of the tank 100, its central axis coinciding with the tank's axis. The guide tube 12 divides the middle of the tank 100 into Zone A within the guide tube 12 and Zone O outside the tube. A second rotor 13 is located above the guide tube 12. This second rotor 13 is linked to the first rotor 5.

[0031] A mud-water separator 14 is provided on the upper portion of the tank 100. The mud-water separator is composed of one or more inclined plates. The inclined plates are high at one end and low at the other end. Water flows upward from the lower end, while mud flows downward due to gravity, thus separating mud and water.

[0032] A water outlet trough 15 is provided at the upper end of the tank body 100. The water outlet trough 15 is annular and arranged around the upper end of the tank body 100. The water outlet trough 15 has a water outlet.

[0033] The device of the present invention is used as follows:

[0034] Sewage (wastewater) enters the mixing zone 4 from the water inlet pipe 6 , and the first impeller 5 rotates to mix the incoming water evenly, and then distributes the water through the water distribution branch pipe 7 .

[0035] Air or oxygen enters the annular tube 10 from the air inlet pipe 9 and then comes out from the air cone.

[0036] The sewage is mixed with the air released by the air cone, and the water flow rotates and rises in the aeration zone (zone O) for complete mixing, aeration and oxygenation. In this zone, the ammonia nitrogen nitrification reaction process occurs, making NH4 + -N turns into NO3 --N (nitrate mixture). Most of the nitrate mixture (3Q~4Q, one Q means one times the flow rate, or one times the water intake, 3Q and 4Q mean three times the water intake and four times the water intake, because there is reflux in the system) enters the guide tube 12 from the upper end of the guide tube 12 under the negative pressure generated by the rotation of the second impeller 13 linked to the first impeller 5 at the top and bottom of the tank, and undergoes endogenous denitrification process, converting NO3 - -N is reduced to N2. The system contains various reducing agents, including C, N, S, Fe, and H (reducing agents can be added from the top of the tank). The reaction process is a denitrification process, primarily anaerobic carbon oxidation and anaerobic ammonium oxidation, supplemented by other reducing agents. The denitrified mixed liquor enters the main aeration zone, where it dilutes the total nitrogen in the influent. Another portion of the nitrate mixed liquor (1Q) undergoes mud-water separation along the upper portion of the biochemical reactor, where it is equipped with inclined plates in a mud-water separator 14. The supernatant flows out of the outlet trough 15 into the outlet pipe. Large sludge particles flow downward and meet the ascending mixed liquor, forming a sludge layer. This mixed liquor undergoes interception and filtration. In this area, solids, liquids, and gases fully mix and react, forming high-density bacterial flocs that facilitate sludge granulation. The remaining sludge is discharged through the bottom sludge discharge pipe 3.

[0037] Example 1

[0038] The treated water volume is 100m3 / d, the gas-water ratio is 6:1-8:1, the dissolved oxygen is 2.5-3.5mg / L, the sludge concentration is 2500mg / L, the impeller stirring speed is between 20-50rpm, and the hydraulic retention time is 7-10h.

[0039] Influent water quality: COD cr =290mg / L, BOD5=130mg / L, SS=250mg / L, TP=6mg / L, TN=45mg / L, NH4+-N=30mg / L.

[0040] Outlet water quality: COD cr =50mg / L, BOD5≤10mg / L, SS≤20mg / L, TP≤1.0mg / L, TN≤15mg / L, NH4+-N≤5mg / L.

[0041] Example 2

[0042] Water volume 50m3 / d, influent water quality: COD cr =320mg / L, BOD5=138mg / L, SS=220mg / L, TP=5mg / L, TN=52mg / L, NH4+-N=45mg / L.

[0043] The residence time is 12h, the sludge concentration is 2500-2800mg / L, the air-water ratio is 8:1, the dissolved oxygen is 2.5-3.5mg / L, and the impeller stirring speed is between 20-40rpm.

[0044] Outlet water quality: COD cr ≤50mg / L, BOD5≤10mg / L, SS≤20mg / L, TP≤1.0mg / L, TN≤15mg / L, NH4+-N≤5mg / L.

[0045] Example 3

[0046] Water volume 200m3 / d, influent water quality: COD cr =450mg / L, BOD5=200mg / L, SS=280mg / L, TP=7mg / L, TN=70mg / L, NH4+-N=55mg / L.

[0047] The residence time is 12h, the sludge concentration is 3000-3500mg / L, the air-water ratio is 8:1, the dissolved oxygen is 3-4mg / L, and the impeller stirring speed is between 30-50rpm.

[0048] Outlet water quality: COD cr ≤60mg / L, BOD5≤20mg / L, SS≤20mg / L, TP≤1.0mg / L, TN≤20mg / L, NH4+-N≤8mg / L.

[0049] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A reactor integrating biochemical reaction and mud-water separation, characterized in that: The invention comprises a tank body (100), wherein the bottom of the tank body is a funnel-shaped mud discharge area (2), and the mud discharge area (2) is connected to a mud discharge pipe (3) at the center of the bottom; a water distribution unit is arranged above the mud discharge area (2), and the water distribution pipe comprises a water inlet pipe (6), a water mixing area (4) connected to the water inlet pipe, and a water distribution branch pipe (8) connected to the water mixing area (4); a first rotor (5) is arranged in the water mixing area (4); a plurality of water outlet holes (8) are arranged on the water distribution branch pipe (7); an air distribution unit is arranged above the water distribution unit, and the air distribution unit comprises an air inlet pipe and a plurality of concentrically arranged circular ring pipes; the air inlet pipe is connected to the plurality of concentrically arranged circular ring pipes; each circular ring pipe (10) is provided with a plurality of air cones (11); a guide tube (12) is arranged in the middle of the tank body (100); and a second rotor (13) is arranged on the upper part of the guide tube (12); A mud-water separation device (14) is provided on the upper part of the tank body (100); and a water outlet trough (15) is provided at the upper end of the tank body (100).

2. The biochemical reaction and mud-water separation integrated reactor according to claim 1, characterized in that: There are a plurality of water distribution branch pipes (7) which are respectively connected to the mixed water areas (4); the water distribution branch pipes (7) are radially distributed with the mixed water area (4) as the center.

3. The biochemical reaction and mud-water separation integrated reactor according to claim 1, characterized in that: The annular tube is a plurality of concentric annular tubes with different diameters, and each annular tube is provided with a plurality of air cones.

4. The biochemical reaction and mud-water separation integrated reactor according to claim 1, characterized in that: The second rotating wheel (13) and the first rotating wheel (5) are linked together.

5. The biochemical reaction and mud-water separation integrated reactor according to claim 1, characterized in that: The mud-water separation device comprises a group of inclined plate fillers; the mud-water mixture flows from bottom to top, and the mud flows downward along the inclined plates due to gravity, thereby performing mud-water separation.

6. The biochemical reaction and mud-water separation integrated reactor according to claim 1, characterized in that: The water outlet trough (15) is a ring-shaped triangular weir, which is arranged around the upper end of the tank body (100).

7. A method for sludge granulation, using the device according to any one of claims 1 to 6, the method comprising the following steps: the sewage is mixed with the air released by the air cone, the water flow rotates and rises in the aeration zone for complete mixing, aeration and oxygenation, and the ammonia nitrogen nitrification reaction process is carried out in this zone to make NH4 + -N becomes NO3 - -N; Most of the nitrate mixed liquid enters the guide tube (12) from the upper end of the guide tube (12) under the negative pressure generated by the rotation of the second impeller (13) linked to the first impeller (5) at the top and bottom of the tank, and undergoes an endogenous denitrification process to convert NO3 - -N is reduced to N2; there are multiple reducing agents in the system, and the reaction process is mainly anaerobic carbon oxidation and anaerobic ammonium oxidation, supplemented by other reducing agents, which is a denitrification process; The denitrified mixed liquid enters the main aeration zone again to dilute the total nitrogen in the influent; the other part of the nitrate mixed liquid (1Q) is separated from the mud and water along the mud and water separation device (14) provided with an inclined plate on the upper part of the biochemical reactor, and the supernatant flows out from the outlet trough (15) into the outlet pipe, and the large particles of sludge slide down and meet the upward mixed liquid to form a sludge layer, which intercepts and filters the mixed liquid. In this area, the solid, liquid and gas are fully mixed and reacted to form a high-density bacterial floc, and the sludge is granulated.

8. A method for treating sewage, using the device according to any one of claims 1 to 6, the method comprising the following steps: the sewage is mixed with the air released by the air cone, the water flow rotates and rises in the aeration zone for complete mixing, aeration and oxygenation, and the ammonia nitrogen nitrification reaction process is carried out in this zone to make NH4 + -N becomes NO3 - -N; Most of the nitrate mixed liquid enters the guide tube (12) from the upper end of the guide tube (12) under the negative pressure generated by the rotation of the second impeller (13) linked to the first impeller (5) at the top and bottom of the tank, and undergoes an endogenous denitrification process to convert NO3 - -N is reduced to N2; there are multiple reducing agents in the system, and the reaction process is mainly anaerobic carbon oxidation and anaerobic ammonium oxidation, supplemented by other reducing agents, which is a denitrification process; The denitrified mixed liquid enters the main aeration zone again to dilute the total nitrogen in the influent. The other part of the nitrate mixed liquid (1Q) is separated from the mud and water along the mud and water separation device (14) with inclined plates on the upper part of the biochemical reactor. The supernatant flows out from the outlet tank (15) into the outlet pipe. The large sludge particles slide down and meet the upward mixed liquid to form a sludge layer. The mixed liquid is intercepted and filtered. In this area, the solid, liquid and gas are fully mixed and reacted to form a high-density bacterial floc, which is used to granulate the sludge. Clean water is discharged from the upper end of the tank and sludge is discharged from the bottom of the tank.

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